Knife-sharpener.



\gW/TNESSES BY W W. B. LYNCH.

KNIFE SHARPENER.

APPLICATION FILED 211.12, 1914.

1,098,672. Patented June 2, 1914.

ATTORNEY UNITED STATES PATENT OFFICE.

WILLIAM B. LYNCH, 0F PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO HOWARD I1. NEFF, 0F BALA, PENNSYLVANIA.

KKIFE-SI-IARJPENEB.

Specification of Letters I'atent.

Patented June 2, 1914;.

Application filed February 12, 1914. Serial No. 818,345.

To all whom it may concern Be it known that I, WILLIAM B. LYNorI, a citizen of the United States, and a resident of Philadelphia, Pennsylvania, have invented a certain new and useful Knife-Sharpener, of which the following is a specification.

My invention relates to knife sharpeners, particularly adapted to be used on kitchen and table knives in the home or hotel and provides duplicate wedge-shaped channels for sharpening the different sides of the edge of the blade, each channel having an abrasive or cutting surface on one side and a cylinder upon the other. The cylinder is conveniently located midway between the two surfaces.

1 have preferred to illustrate my invention by a form thereof which in use has proved to be practical, efficient and inenpen sive and which at the same time well illustrates the principles thereof.

Figure 1 is a perspective view of the preferred form of my invention. Fig. 2 is an end elevation of the construction shown in Fig. 1. Fig. 3 is a transverse section of a construction similar to Fig. l, with a knife blade in position. Fig. 4 is a broken longitudinal section of Fig. 1.

Similar numerals of reference indicate like parts.

I mount the effective parts of my invention upon suitable legs or standards 1, 1, adapted to be secured to any piece of furniture or part of the wall by means of fastenings inserted in openings 2. In the form shown the supporting standards are placed at opposite ends of a substantially V-shaped or trough-shaped frame 3 and rigidly secured to it by fastenings l. The interior of each of the sides of the frame is recessed, in the illustration, to receive and hold a removable plate 5, so that the abrasive or cutting surface 6 of the plate will face toward the interior of the frame. This permits me to use cast iron or other relatively inexpensive material for the frame, with more effective and expensivematerial forthe plates.

The standards 1 are extended above the fastenings 4, as at 7, to provide bearings for the fastenings 8, by which a blade guide or guides is or are supported so as to take the thrust of one side of the blade while the edge is being sharpened on the opposite side. This function is most conveniently performed by a single spacing block or guide located midway between the cutting or abrading surfaces. I show a cylinder 9 in th1s position and support it so that it will rotate freely. This free rotation is accomplished in any suitable manner, that illus trated being best shown in Fig. 4.

Some of the advantages of my invention may be secured even with the cylinder fixed against rotation, which may be done in my present construction by tightening the supporting screws. l: have considered it unnecessary in view of this suggestion to illustrate other means of securing the cylinder in rigid position.

In operation, the knife blade 10 is inserted as seen in Fig. iand is drawn longitudinally, lengthwise of the cylinder to sharpen one side of the edge and the operation is performed against each of the cutting plates in turn or against either one more than the other as may be required to give an edge having uniform slope for both sides, gain ing considerable advantage in this particular over a sharpener whose cutting surfaces act at the same time, in case these surfaces are not equally eiiicient. The sloping surfaces of the intervening guide, the cylinder 9, provide a feeding edge which offers as little resistance as possible to longitudinal movement of the knife, thus giving a maximum efiect to the sharpening of the one side of the blade adjoining the edge at a time and the rotatability of the roller causes the knife edge to be wedged farther down into the space between the cylinder and the surface 6, with the same pressure applied or maintained upon the knife blade.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a device of the character stated, a frame having diverging sides and sharpen ing surfaces upon the inner faces thereof, combination With a rotatable cylinder eX- in combination with a cylinder extending tending longitudinally of the frame and longitudinally of the frame between the lying close to each of the surfaces.

sides and lying close to each of the surfaces. WILLIAM B. LYNCH.

2. In a device of the character stated, a Witnesses: frame havlng dlverglng sldes and sharpen- HOWARD L. NEFF, mg surfaces upon the lnner faces thereof, in VILLIAM A. LYNCH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. G. 

